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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89dfbda41d4d5f8a4e57dacecfd239cb6fb1837ee4675e2e5b062bf2a7a55f72' 
  AND token = 'e0OKnjUHXSI/xmkAgv2t8QJ99oPcMR+QeP3ZLXqvaIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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