SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62c07710f9a32db245c7da8761252cb885da00e8d06d615b41c725367675b3f' 
  AND token = 'qi4mDYuHSwWwUjvtRLet+OZOadTqsJhwfq0M6kgJ6l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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