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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1302795d853e33b49d629ed69d7cecf67abe0466bc82c77e06df40cb3c52fc6f' 
  AND token = 'dhUyOD/UM+Y0AW/BwrH98dWWx+7nUIUk5hh2YxafBuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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