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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a88baa3603c8cea7edab342e72e5be9517e25cb4aee3d3f4d29c8d38f40437' 
  AND token = 'hce9FUaUPw4bYSuKvJGVSZkOHSigkM0Egpq8SoSex+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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