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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8a201ccdb40fc2321081ab5ee4d740fc4957c6f64376cb1f06d0fb89d7f822' 
  AND token = 'M10fIzLahf4jh9af07b666KvwYemCrsgiX9bcyb5r9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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