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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1116ffd6124d8cb40a549eedd97751386d0f3459955e04ee861596709c576046' 
  AND token = 'Hb4C8S3tG5DKqbLz3TcQPmVRspGvwGrGTd/VL0gRqQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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