SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6097cda5d71b33e976325b30f354bf928978e4a4b8ebfffc640b6581dbc17845' 
  AND token = '/7m9wr6zLxMFF2yYcjYxjkGOD3HnlPMr1dzVS3zquJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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