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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36bfc5ffca4561bb9b50524a8c6385cc4f348b4a9a4a3000c668ca4e2950c3c1' 
  AND token = 'wOXATTDpM2tqEPYnk7uvkKVk7/Klok29+4H+0zPXavM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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