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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbf5985f0b03dc30b74ee3a97b01a9f9e8eefbaa5d2636161fa45e048bd36e5' 
  AND token = '9Ic0YnuO+a/QYLXvOQypa2H9MUxNY5DNM10ERyvrwwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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