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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c518bf3b6e111fe5a8d8933fc1a932601de6d600c47cc1b90114dc98c196c90' 
  AND token = '4JQTCpvh7c3DGXlj2SAO7wuAk5TigkUzOJADCUTbYww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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