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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dffb459cbc4aa37e537695716fad15388444d4937b7292c4aeb1153a35e46a70' 
  AND token = 'RT6Qt8B2pWm6C1q9WpyB2o8qD+FmcmKb7Mntr8BhIm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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