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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1179c5bf12dd928011369a6f56d34840893ed291e36dedfd156748f640da4c91' 
  AND token = 'Ms9SvlNz8KiKe0Tp990jsTQCOcM6NCWZaX0zheM1DbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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