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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be76d2c3c26e82353e46e1b492b404fdd23a7b991ea9609dd1ba22953ba41da' 
  AND token = 'FkO6vIgyZrM78mdbP6A4oZFL840UsV3iOM/WAb9KV3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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