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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b11d04ca64571222aaed0655206f2887807074ba8cac901172c3e42c31b3f86' 
  AND token = '/Iv89QlPqlcr7EVaT66YDMzjSjEWJd6ifUZCnYyVyiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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