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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce2adca7afe7bb2bf674d8486c4580eef409977b9cd0b762c548fe4e28ec946' 
  AND token = 'GCn7IFJgjj0KznqQW8uWnxqJNAUo7ZME8f9n1JZUbuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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