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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b4a0205585d26021f1dda5670c603642f156afe40d8d57ea7d663f8a887ac3' 
  AND token = 'wK8JizL89eIyXU9nFqr7+4JkjdqU3LeElFNBtrbDsCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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