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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0d47260e5f3b1f6211751632d86ac75e22311dd9d79e842fc3e9274a8efdc3' 
  AND token = '/hEHolZl8chkQK6/y7/iIQdnskxDwo0p2czMXzCSYD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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