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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc1076ac01ff84414d00179aff484d6bf7add11c748871d564642bdebf79cc3' 
  AND token = 'j/jFMZan8ekIOc9F9isoC01I1Mb0WAlSoD2CSQRVcKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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