SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58df71632f6751e2c3a5ec794a03bd285664242af37392daa576411a942ffcf' 
  AND token = '+1ZgJtlEW0n4DGgTQxho8BZhrsVqeZ9GroPoLE+7N2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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