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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a0c7893305db4be61396b65a4bc22a8fbfbfac82cc4b5f5d60571e28e962a87' 
  AND token = 'lgp3k/Eqj2V/CMuL+XQqU8KOETL0D9drQXl4yojxoQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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