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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8baa4b5e08448319481b154c1e1a868198fb811378816206f06e564d7bde820' 
  AND token = 'LkVHGa3flk1nQDb5RwD78dVMo81+00KMJ4XWrHLC/xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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