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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6cebacb11e17eca7f48f6adcc0cdf9be7cd0da0a312ddd040a25d29387ca67' 
  AND token = '0k7oePxaj+sqzZH3qS9uN4JDi6zx1QgbP7jyEDT0QDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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