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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bda714b203a2d0519c060216890e98bdd32c34bb8d03cb6e45c13fc8920df54' 
  AND token = 'DHbhfSH75rH6dU7GRgfI+PVC7dHQgrQ3IUZhkuR/0QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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