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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cebe795b561c264a9170b405151a92e737c90b94d2eccb8c2cc341cf1cb1575' 
  AND token = 'rYeROI0V/49L/tavRrA7G5RHYeV6TeOo9IVTvYgwM08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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