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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5a796a529ce9025b4cb291797d34e15e10e0359a13ad484fa7d2aa7f1e6aa0' 
  AND token = '9mPNuNHkFVVCR6Sd8EuZJ7K0WibP9VSG82gnAphUCQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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