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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52003567844e61af80e1b3c0dad5f06f34f53e44eab18d164046671b31928cf9' 
  AND token = 'Yo8mVopsUnhDQ8lQGjlZKDHyl7eGvFkMJQGXJ5n11H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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