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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76aa11a0fed7e67ec66223f95a0c94416b9b191c910fe09b5b5a897ef19a86c' 
  AND token = '8fWryEEF/+7nOhcvPFXE/HAi1FQCbySmci1v7RsRM80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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