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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adedaca38a4594bb91ed190d8db23773e94edab8010951669fa0c4cac83a742d' 
  AND token = '9q9Ew73dhIfHgrqY3G5IufUMORoFcT/pi3OiNIojjdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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