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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25eb1532d22ec190547317b3b357eb361312bc21023b974d6dcfae85cf714156' 
  AND token = 'yl5/EHqNzirshFlI4oRYyK6dHwK45Ry6f7ejr79aU2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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