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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9224c9fa295fdf984cdf9063eaa2463cf7a293b28e088497e72808731c2f27d' 
  AND token = 'ZdWRC971bcc1h6wshnpxwHRxrJQahqkVZ2vPJrgtBEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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