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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ad4ba64bdc4658e9aa26df3fc8b00f5036f14454697ea94e083572ac82f258' 
  AND token = 'Hw05EOlOiHQLeTUY+WLMEYeaj9/b9PNh0/1dP7gV9nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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