SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e9a2a8692091c20f284e463e5324d9f31065c07ffb9f1d7f4b702dc5f90680' 
  AND token = 'GRifWZy8F4oR/5CKCMilM+6bmpv0jTH0xGN2DIRP1BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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