SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c769a44eef55ebcfa8192ea7a9642f47054182dff672ae48246adb09b467c633' 
  AND token = 'zdh3+lglX/GVWnBQ7rFONPyaM4vUas18RH0K12ZjCGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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