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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd402a038998f5b06352a063a0a431db83b35d4b8a74e71c97ec190699612ea12' 
  AND token = 'oOLd2QFTwaY7i2ES5B0ohnvvI2MkfGZun49rWg9bOvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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