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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e999ce465a848640c23f1673fc13fe23e560b0f3be8aa8cbf9aef97a63826fe9' 
  AND token = 'rox+P1WZv/QRAZHLh/RlH9plnv1bA+naErmKLbW23wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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