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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847b64dc8889f7490fe4d4d5e9fb187fddbca2ee4ae3f5b963050377bf917244' 
  AND token = 'b38mYwn+w+ZiFOY/Km+osS9MkNfK4XMdDP7JMJlJBzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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