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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79db802735f3142502554e46ba59da776d055acf4846fa6c13b876fec2724015' 
  AND token = 'uF30WlLpF0NE+gAe7akyfIcz3HI/l2mCqnf4frWteQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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