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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730fbdcdd2858339592dcc9ece5c0fa198685bf49cf3a601a85967b015c2c32b' 
  AND token = '7EBg8CsPLwK3AzwfxMWGNZnR+TkRmIsPYTHWrNknxA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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