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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79301c007a68aa11fe5ea907dea0dbf4028f681f7b0c29ff62a656f96bf0de87' 
  AND token = '2CZQm+br0hD9FJfqTYd6fHL9hskvJjsG3IxoudITT0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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