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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00cdbbd974c4330ac999eb0a80b5b7fcffff23260de09d1de2ad70ad31c75b70' 
  AND token = 'NQJHBxOYbAnhEo6/LdfVhECBoVhRY9Uxl0J6fsM2Xmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}