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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5386ff623a93768d2cef6cada9cf51ecbd0ca82abc19a720e4f0971669c8202' 
  AND token = 'GkHVjA2MSB3zqrY8R96h2ckVgaJ/zR5WEIDPEIMClV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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