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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74873cc87c39939dee1759510306e2f8d5bf83de0ad6dfeeb33bb273dcc6c078' 
  AND token = '+k98cjcPbHeT8muy8WCvzaBjFbxrM+cTz9iPGoJ9txE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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