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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c0dc3b45ecac629960e446450a476cd17ab33786b7959293363ae74a525b6c' 
  AND token = 'BLxqHz+RR5GLkY3DzuzY2y+/hM9i05mAyxboFz3djqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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