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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5888b908e1492564766970c0c207bffae728b64cb07ea2b2e061b06d68f05202' 
  AND token = '9Fyw6c6b6ioUiCO5QZbZmGf5RQI1dGzZZ22RMkq9Fzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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