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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360ddcf9120d878c160c1cf6ee4a36e933a48fede3b0f0f1424e02650d349a9e' 
  AND token = 'mCcaM0OI8AMpN7P2GlI/xuvshsYyTgFXWxA8o7mpRoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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