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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b5911ee5c8f1b34917babb245d63ced1cc1f031420e03f6557bffe70026059' 
  AND token = 'A3c0nAXuKRhKY35SZ21kDy/verkLjIFlDJAfPrMxDL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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