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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3016da6f29607a9f8069492b213950f1244fea1af9987aec1a70d3810a302e' 
  AND token = 'hLud7ifDEbdKziO431ZCEkojEfKu2mSX6b4EtXc5OxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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