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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91cfac9880529f553f96ff6ed3b4e5080bf38b34448beb529e54d4841d5a046e' 
  AND token = '2qRfenWvHHdZZ/0VLQPOiWUZ6apFCqg/lSsQwn+dcyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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