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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e74d79e64a59cec1e02050128bf698c8bbf8c39c17603493393c1780f3d747' 
  AND token = '0r6448rHns8B4yDQBOcpwu03goUAZQfbrH5z1G2EQhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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