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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bae6977d532e5495fb743d30747c2cc293495cd55c1b1509365b20e59e4e885' 
  AND token = 'fDN+DVuHt2xBVEhsI52OHmNgzpd/dRI8aS4PJHF16ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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