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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62a303cc29c60c00dcb493b74d1b4eae19e901237fa74749362c7facb71ca0b' 
  AND token = 'syrt0XDOLmHeSeeVvODz6rSeIfvG7ZVrTvRc/u+rUyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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