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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb68d0ff866f716f10b25a695d0cdfd55910dd781ccc7b9f395f7d91b58f1ee' 
  AND token = 'QbRyh+7QGfk0B7f+1lhYOA+0aqIQuTEqMzfS0HOkQOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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