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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2086b9af1da823d42c4c6a8eca6995dd303798cc1c820e816bd182ccb624c6c1' 
  AND token = 'GTGK1kp/Q11sDECl51G9Bw+lUHcBKveLEczeSpFu8/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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