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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b821eb8ad20e6a84c914081d28a79953682603c79a4c961c0c85fdae56ef8b77' 
  AND token = 'PZQ/cEWjzumjW9eoZDvJ8Rc+8yQrwr8lWoTRS0PWJp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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