SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dfe338e4b4b75ce61d1c14469632d8cf82703d67eabb8d7dfbda35134d036cc' 
  AND token = 'z1AOzdq2/Lq0OB4h9vGPnbIwlWsmPGwwW6lfIrZuc+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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