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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6606d94b352ff015a24f970709e5adb3dcde941f00b5f8407982740a632335' 
  AND token = 'Rc60LxMynbQ4cVpNeNHWLpKyFEvp0tRwtPl6e6sgZTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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