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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3022f260b51bf8a6b25b7fb10b5ed911f37875b000565be67755ef8e1f00dde9' 
  AND token = 'xYFmKRjd8q55QgeHP58NNC3HI0SJGqJPYpi1RyTzTDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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