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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b735cd7c925a45ed1fd9d075f2f1703c412cd0c21a16c46d8384a54b037e763' 
  AND token = 'vOZIbZJD4gcv5EqS1HdmTZNrw6J6jg/ssc7s+lPhSD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00174

JSON explain

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