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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88fb63033d52820e5f09fbed7833d7e353b56ef4b6fadf7862d042f657c36cae' 
  AND token = 'OamIe8fdjtvlyOEGWb0I0JU0OxxPa+oltdrYqQxIcQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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